Valve mechanism for channeling-machines.



H. v. HAIGHT.- VALVE MEGHANISM POR CHANNBLING MACHINES.

APPLIUATION FILED NOV. 22, 1906.

Patented May 11, 1909.

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UNITED STAE HARRY VEROOE HAIGHT, OF SHERBROOKE, QUEBEC, CANADA, ASSIGNOR TO INGERSOLL- RAND COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

VALVE MECHANISM FOR CHANNELING-MACHINES.

No. 921,240. Specification of Letters Patent. Patented May 11, 1909. Application 'Iled November 22, 1906. Serial No. 344,552.

To all whom it may concern: vice 10 is located at the rear end of the cylin- Be it known that I, HARRY VERCOE der and is rovided with the usual rifle bar HAIGHT, a subject ofthe King of Great Brit- 11 arrange to engage the work piston 2. ain, and resident of Sherbrooke, in the Prov- The valve casing is denoted by 12 within ince of Quebec, Canada, have invented anew which casing there is fitted to reciprocate eo and useful lmprovement in Valve Mechanparallel with the tool piston 2 a main cylinisni for Channeling-Machines, oi which the drical valve 13. T his valve 18 is provided following is a speciiication. with a reduced end 14 and an enlarged end 1 5.

The object of my invention is to provide A chamber 16 of smaller area is provided becertain improvements in the construction, tween the reduced end 14 of the main valve 65 form and arrangement ofthe several parts of and its front cap 17, a bushing 1S being ema valve mechanism of that type in which a ployed for lilling the bore up to the diameter main valve and an auxiliary l'iuid controlling of the valve. A large chamber 19 is provalve are employed for controlling the revided between the enlarged end of the l5 cipiocating movements of the worr piston. main valve and the inner end of the rear 70 My invention consists generally in an auX- cap 20. iliary controlling valve operated positively rlhe main Huid supply passage is denoted by the work piston in its reciprocating moveby 21, from which passage branch fluid supments and specifically in a tappet arranged ply passages 22, 23, lead to the fluid supply 20 to be engaged by the end of the tool piston port 24 which surrounds the main valve 13. 75 for moving the auxiliary controlling valve The main exhaust passage is denoted by in one direction while the spring is utilized and it is provided with end ports 26, 27, for moving the auxiliary valve in the other surrounding the valve 13. direction, the construction being such that a The. front and rear cylinder are 25 very long stroke may be imparted to a short denoted by 28, 29, and the valve ports by 3i), so piston. 31, which ports surround the valve 13, the A practical embodiment oic my invention port being located between the liuid inlet is represented in the accompanying drawing, port 24 and the exhaust port 26 and the port in which- 31 being located between the fluid inlet port 30 Figure 1 represents a channeling machine 24 and the exhaust port 27. The passage 2S 85 cylinder and its adjacent parts iii longitudiopens into the cylinder adjacent to its front nal central section, the piston being near the end and the passage 29 opens into the cylinlimit of its rearward movement, Fig. 2 is a der chamber at a distance from its rear end. plan view ci the valve casing, Fig. 3 is a rEhe valve 13 is reduced to form bridge transverse section through the valve casing ports 32, 33, arranged to alternately bring 9o proper with the end caps and valves rethe 'fluid inle"y port 24 into communication moved, the said section being taken in the with one. of the cylinder passage ports 30, plane ci the line AMA oi Fig. 1, Fig. 4 is a 31, and the other cylinder passage port iii transverse section through the valve casing communication with either the exhaust port 40 taken in the plane ci the line B of Fig. 1, 26 01'27. livhen the valve 13 is at the limit 95 Fig. 5 is a transverse section taken in the of its forward nicvemeiit,tl'ie iluid inlet port plane of the line C-C oi Fig. 1, and Fig. 6 is 24 is opened to the rear cylinder' passage port a detail transverse section showing a fluid and the front cylinderpassage port 31 is open pressure spring instead of a metal spring for to the exhaust 25 through the port 27. The

moving the auxiliary valve inwardly. chamber 16 at the front of the reduced end ico The channeling machine cylinder is de- 14 of the valve. is at all times 1n open comnoted by 1 and its piston by 2. munication with the iotive fluid supply in The piston chamber space to the iront lof the present instance, b v means of a passage the piston is denoted by 3 and the space to 34 which leads from the fluid inlet port 24.

the rear of the piston by 4. A rocking tappet 35 of plate forni is hinged i c; The rear head is denoted by 5 and the front at within a slot 37 which opens to the iiihead by 6. terior and exterior' of the cylinder, the outer The usual cushioning device 7, 8, and face ofthe said slot being closed by .the valve cushioning valve 9, are provided at the 'front casing 12. This tappet 35 is provided with of the cylinder chamber and the rotation dea depending lug upon one side of the pivot i 36 in position to be engaged by the rear end of the work piston 2 and raised out of the interior of the` cylinder 1. The valve casing 12 serves as a stop for limiting the inward rocking movement of the tappet 35. The rear end of the tappet 35 engages the inner end of the auxiliary fluid controlling valve 39. This valve 39 is fittedv to slide longitudinally through the rear cap 2() of the valve casing, holes 40 and 41 being formed through the walls of the casing in alinement with the bore through the said cap 20.

rFhe tappet and auxiliary valve are yieldingly held at the limits of their inward movements by spring pressure, either by the metal spring 42 interposed between the outer end of the auxiliary valve and a plug` 43 screwed into the hole 40,: or by a motive fiuid spring produced by forming the outer end of the auxiliary valve of greater area than the inner end, as shown in Fig. 6, and providing a inotive fiuid passage 51 leading from the fluid supply passage 22 to the space 40. A port 44 leads from the chamber 19 at the enlarged end of the main valve 13 to the face of the auxiliary valve 39. A. fluid inlet port 45 surrounds tlie auxiliary valve 39 and communicates at all times with the branch fluid inlet passage 22 through a passage 46. A fluid exhaust port 47 surrounds the auxiliary valve 39 and a. passage 48 leads therefrom to the exhaust port 26 of the main exhaust passage 25. This auxiliary valve 39 is provided with two reduced portions 49, .50, which form bridge ports arranged to alternately open communication from the motive fluid supply port 45 to the port 44 and the port 44 to the exhaust port 47 according to the position of the auxiliary valve. When the auxiliary valve is at the limit of its outward movement as shown in the accompanying drawings, the chamber 19 is in open communication with the motive fiuid supply 45 and the exhaust port 47 is closed. 'W hen the metal spring 42 is used the outer and inner ends of the auxiliary valve may be of substantially equal area and the fluid pressure on both ends is equalized by the passage 51 before referred to, leading to the outer end of the valve, and the slot 37 opening the interior of the cylinder to the inner end of the said valve.

A recess 52 may be provided in the cap 2O at the rear end of the chamber 19 which recess is of the same area as the 'valve 13 for providing an effective area to start the main valve 13 toward the limit of its forward movement when it is at the limit of its rearward movement. A. disk 53 of enlarged area is provided at the rear end of the main valve 13 for the purpose of acting as a stop for the valve against the inner end of the cap 20 around the recess 52. 4

In operation, supposing the piston to be in the position shown in the accompanying drawings on its movement toward the rear end of the cylinder, it has raised the tappet 35 because of the engagement of its rear end with the lug 38 and has lifted the auxiliary valve into position to permit the motive fluid to enter the chamber 19 at the rear end of the main valve 13 thus throwing the main valve to the limit of its forward movement owing to the difference in area between the chamber 1.9 at the rear end of the main valve and chamber 1.6 at the reduced front end of the said valve. This movement of the main valve has opened the motive fluid inlet port 24 to the port 3() of the rear cylinder passage 29, At the same time, the main valve 13 has opened the space 3 at the front of the work piston 2 to exhaust through the front passage 23, its port 31, the exhaust port 27 and exhaust passage 25. As the piston 2 travels toward the limit of its rearward movement, it has closed the passage 29 to the space 4 and has compressed the air in the space 4 thus preventingI the piston from striking the rear head. This compression of the air will start the piston on its forward movement and as soon as it passes the mouth of the passage 29, the motive fluid will flow into the space 4 and complete the forward stroke of the piston. As the end of the piston 2 leaves the tappet 35 the spring pressure on the auxiliary valve will force the auxiliary valve and the tappet 35 inwardly until the forward extension of the tappet abuts against the valve casing. T his inward movement of the auxiliary valve will open the chamber 19 at the enlarged end of the main valve 13 to exhaust through the port 47, passage 43, exhaust port 26 and exhaust passage 25 and will also close the motive fluid. supply port 45 to the port 44. The pressure exerted upon the reduced end 14 of themain valve by the motive fluid in the chamber 16, will throw the main valve back to the limit of its rearward movement and thus open the motive fluid inlet port 24 to the port 31 of the front cylinder' passage 23 and also open the port 30 of the rear cylinder' passage 29 to the exhaust port 26 of the exhaust passage 25. This will cause the return movement of the tool piston after it has struck the cushioning ring 7.

By utilizing the rear end of the work piston for operating the tappet to move the auxiliary valve, l am enabled to provide a very short work piston with a long stroke thus materially increasing the effectiveness of the same. Furthermore, by opening the chamber at the rear of the piston 'to the admission cf motive fluid just before the rear cylinder passage is closed, I am enabledv to procure an effective cushion for the piston, which compressed fiuid will give an impetus to the forward movement of the piston.

In using the word spring in connection with the means for moving the auxiliary valve inwardly it is to be understood that either a metal spring or a fluid pressure spring is intended.

lli/Thilo l have shown and described the valve mechanism in connection with a channeling machine cylinder, it is to be understood that it may be effectively utilized in connection with work cylinders and pistons of various types, without departing from the spirit and scope of my invention hence l do not wish to limit myself strictly to the structure herein set forth, but- What l claim is rlhe combination with a cylinder' and its piston, of a spring pressed fluid controlling valve arranged in position to be moved positively in one direction by the rear end of the piston and in the other direction by spring pressure, the said piston having a forward movement beyond the said valve.

2. The com -ination with a cylinder and its piston, of spring pressed lluid controlling valve, a valve operating tappet arranged in position tO beengaged by. the rear end of the piston for positively moving the valve in one direction, the valve being moved in the other direction by spring pressure the said piston having a forward movement beyond said tappet, and means for limiting the inward movement of the tappet.

3. `he combination with a cylinder and its piston, of a sprinfy pressed fluid controlling valve, a valve operating tappet mounted in the side of the cylinder between the valve an( pist-On and arranged in position to be engaged by the rear end of the piston for positively movingl the valve in one direct-ion, the valve being moved in the other direction by spring pressure, the said piston having a forward movement beyond said tappet, and means for liinit-ing the .inward movement Of the tappet.

el. rlhe combination with a cylinder and its piston, of a main valve and a spring pressed auxiliary valve arranged in position to be moved positivelyv in one direction by the rear end of the said piston and in the other direction by spring pressure for controlling the movements of the main auxiliary valve in both directions, the said piston having a forward movement beyond said valve.

5. The combination with a cylinder and its piston, of a main valve, a spring pressed auxiliary lluid controlling valve, an auxiliary valve operating tappet arranged in position to be engaged by the rear end of the piston to move the auxiliary valve positively in one direction, the auxiliary valve being moved in the other direction by spring pressure for controlling the movements of the main valve in both directions, the said piston having a forward movement beyond said tappet, and means for limiting the inward movement of the tappet.

6. rlhe combination with a cylinder and its piston, of a main valve, a spring pressed auxiliary valve fluid controlling valve, an auxiliary va ve operating tappet mounted in the side of the cylinder between the auxiliary valve and piston and arranged in position to be engaged by the rear end of the piston for positively' moving the auxiliary valve in one direction, the auxiliary valve being moved in the other direction by spring pressure, for controlling the movements of the main valve in both directions, the said piston having a forward movement beyond said tappet, and means for limiting the inward movement of the tappet.

7 The combination with a cylinder and its piston, of a main valve, a single spring pressed auxiliary valve for controlling the movements of the main valve in both directions and single auxiliary valve Operating tappet arranged in position to be engaged by the rear end of the piston to move the auxiliary valve positively in one direction, the auxiliary valve being moved in the other direction by spring pressure, the said piston having a forward movement beyond said tappet, and means for limiting the inward movement of the tappet.

8. The combination with a cylinder and its piston, of a main valve having one end of smaller area than the other, the outer side of the smaller end being open at all times to motive fluid pressure, and a spring pressed auxiliary valve arranged in position to be moved positively in one direction by the rear end of the said piston and in the other direc tion by spring pressure for controlling the movements of the main valve in both directions, the said piston having a forward movement beyond said auxiliary valve.

ln testimony, that lclaim the foregoing as my invention, l. have signed my name in presence of two witnesses, this twentieth day of November 1906.

HARRY VERCOE HAIGHT. -'rlfitnesses OLiviin Minwoon BROWN, SAMUEL ROBERT NEWTON. 

